Abstract
Patterns of seasonal variation in testosterone (T) and T-dependent measures are poorly understood in humans and particularly in women, despite their importance in other animals. We examined seasonal fluctuations in salivary T in women and men, and waist-to-hip ratio (WHR) in women. Participants were 220 women and 127 men from central and West Coast North America. Results showed that T was significantly highest in autumn for both women and men, and that WHR in women closely matched the seasonal variation in T, with high values in the fall and summer. This suggests that T does show a reliable fluctuation over the seasons, which may result in meaningful fluctuations in behavioral, cognitive, and somatic variables associated with T.
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